Overwrite the handler using Set.

src/list-inl.h

Index: src/list-inl.h
diff --git a/src/list-inl.h b/src/list-inl.h
index d815a7e227004ac6accdca4f928da1d362addabf..143c830ee92ad3d11fe62372dc2a6947557ef8c3 100644
--- a/src/list-inl.h
+++ b/src/list-inl.h
@@ -104,6 +104,13 @@ Vector<T> List<T, P>::AddBlock(T value, int count, P alloc) {
 
 
 template<typename T, class P>
+void List<T, P>::Set(int index, const T& elm) {
+  ASSERT(index >= 0 && index <= length_);
+  data_[index] = elm;
+}
+
+
+template<typename T, class P>
 void List<T, P>::InsertAt(int index, const T& elm, P alloc) {
   ASSERT(index >= 0 && index <= length_);
   Add(elm, alloc);